Burning Shadows (Odriel's Heirs #1.5)

There are worse things than the undead... After months on the road, Kaia and Klaus, the Dragon and Shadow Heirs, have chased the remains of Idriel's undead army into the wild western lands of Okarria. There, they encounter the barbaric evidence that the living can be just as bloodthirsty as the undead. Faced once again with humanity's brutality, Kaia will have to discover what she's willing to sacrifice to protect her people... and if it will be enough.